Had a problem this week not experienced before. I like to run my flow flat out and work quick. Works well for me. About mid week I noticed the flow dropping right off. Battery voltage was at 12.9v so battery wasn't the problem. I noticed small bubbles in the output hose almost all the time so tightened all connections. This didn't fix the problem and it got worse on Thursday, down to just a trickle and I'm cleaning at a snails pace compared to my normal rate. Turned out that the pump was sucking air in through the connections as it couldn't get water through the small intake strainer. It was almost completely blocked. I could barely even suck air through it though it still looked new. Removed it and viola, full flow, better than when new. At 3 months old and nearly £10 + postage to replace, I don't think I'll be replacing it. I've rigged up my own.
Hope this helps anyone having flow problems with their Freedom trolley.